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Metadata Identifier: gov.noaa.csc.maps:2007_FDEM_Nassau_m557
MD_DataIdentification
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2007 Florida Division of Emergency Management (FDEM) Lidar Project: Nassau
County
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This report pertains to a Specific Purpose LiDAR Survey of Nassau County,
Florida. The LiDAR aerial acquisition was conducted by Terrapoint USA between August
18, 2007 and September 4, 2007, and the breaklines and contours were subsequently
generated by Dewberry. The PDS team is under contract HS-34-14-00-22-469 with the
Florida Division of Emergency Management (FDEM) and offered LiDAR and derived products
as an add-on agreement with Nassau County at the same rates as negotiated for the
FDEM contract and utilizing the same Baseline Specifications from FDEM. The LiDAR
dataset of Nassau County was acquired by Terrapoint USA and processed to a bare-earth
digital terrain model (DTM) in accordance with FDEM Baseline Specifications. Detailed
breaklines and contours were also produced by the PDS team. Each tile covers an area
of 5000 ft by 5000 ft. The FDEM Baseline Specifications require a maximum LiDAR post
spacing of 4 feet, i.e., an average point density of less than 1 point per square
meter. However, the PDS team required a much higher point density of its subcontractors
in order to increase the probability of penetrating dense foliage; with nominal post
spacing of 0.7 meters per flight line and 50% sidelap between flight lines, the average
point density is 4 points per square meter with higher point density there is a greater
probability of penetrating dense vegetation and minimizing areas defined as "low confidence
areas." LiDAR was delivered as a point cloud in LAS 1.1 format.
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SV_Identification
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2007 Florida Division of Emergency Management (FDEM) Lidar Project: Nassau County |
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Lidar |
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Lidar QA/QC Report |
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None |
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North American Datum 1983 |
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resourceProvider |
http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4269 |
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Citation URL |
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ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/fdem/nassau/lidarqaqcreport_nassau_final.pdf |
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NOAA CSC (originator) |
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DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic
and Atmospheric Administration, U.S. Department of Commerce
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csc.info@noaa.gov |
originator |
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NOAA CSC (publisher) |
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DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic
and Atmospheric Administration, U.S. Department of Commerce
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csc.info@noaa.gov |
publisher |
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NOAA CSC(distributor) |
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DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic
and Atmospheric Administration, U.S. Department of Commerce
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csc.info@noaa.gov |
distributor |
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NOAA CSC (processor) |
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DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic
and Atmospheric Administration, U.S. Department of Commerce
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csc.info@noaa.gov |
processor |
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EPSG Registry |
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European Petroleum Survey Group |
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publisher |
http://www.epsg-registry.org/ |
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Florida DEM |
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gis@dca.state.fl.us |
pointOfContact |
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Florida Division of Emergency Management |
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originator |
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Mike Sutherland(author) |
Mike Sutherland |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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mike.sutherland@noaa.gov |
author |
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Mike Sutherland |
Mike Sutherland |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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mike.sutherland@noaa.gov |
distributor |
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Pamela Grothe |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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processor |
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Terrapoint USA |
LiDAR Manager |
peggy.cobb@terrapoint.com |
processor |
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Terrapoint USA |
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originator |
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ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/fdem/nassau/lidarqaqcreport_nassau_final.pdf |
Lidar QA/QC Report |
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information |
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http://www.epsg-registry.org/ |
European Petroleum Survey Group Geodetic Parameter Registry |
Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured
dataset of Coordinate Reference Systems and Coordinate Transformations.
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search |
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http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4269 |
NAD83 |
Link to Geographic Markup Language (GML) description of reference system. |
information |
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Ellipsoid in Meters |
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urn:ogc:def:crs:EPSG::4269 |
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Bounding Box |
Temporal Extent |
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-84.748761 |
-84.083288 |
30.306119 |
29.962468 |
2007-08-18 |
2007-10-04 |
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2007-08-18 |
2007-10-15 |
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-84.748761 |
-84.083288 |
30.306119 |
29.962468 |
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2007-08-18 |
2007-10-04 |
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2007-08-18 |
2007-10-15 |
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Lidar Use Limitation |
These data depict the elevations at the time of the survey and are only
accurate for that time. Users should be aware that temporal changes may
have occurred since this data set was collected and some parts of this data may no
longer represent actual surface conditions. Users should not use this data
for critical applications without a full awareness of its limitations. Any conclusions
drawn from analysis of this information are not the responsibility of NOAA
or any of its partners. These data are NOT to be used for navigational purposes.
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Ellipsoid |
Ellipsoid in Meters |
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NAD83 |
urn:ogc:def:crs:EPSG::4269 |
North American Datum 1983 |
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Lidar QA/QC Report |
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crossReference |
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Lidar |
2007-01-01 |
Source Contribution: LiDAR dataset was used to create intensity stereopairs
for 3D breakline compilation and for contour generation.Source Type: online
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2008-01-01T00:00:00 |
The ABGPS, IMU, and raw Optech 3100ea LiDAR scans are integrated using
Optech Incorporated's DASHMap, version 1.1 software, Terrascan software and Microstation
software. The resultant file is in a LAS binary file format. The LAS file version
1.1 format can be easily transferred from one file format to another. It is a binary
file format that maintains information specific to the LiDAR data (return#, intensity
value, xyz, etc.). The resultant points are referenced to the NAD83 horizontal datum
and GRS80 vertical datum. The date and time for each flight line can be determined
using the Julian date and time. The Julian date is a continuous count of days and
fractions since noon Universal Time on January 1, 4713 BCE on the Julian Calendar.
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2008-01-01T00:00:00 |
The unedited data are classified to facilitate the application of
the appropriate feature extraction filters. A combination of proprietary filters are
applied as appropriate for the production of bare earth digital terrain models (dtms).
Interactive editing methods are applied to those areas where it is inappropriate or
impossible to use the feature extraction filters, based upon the design criteria and/or
limitations of the relevant filters. These same feature extraction filters are used
to produce elevation height surfaces. The LiDAR mass points were delivered in American
Society for Photogrammetry and Remote Sensing LAS 1.1 format. The header file for
each dataset is complete as define by the LAS 1.1 specification. In addition the following
fields are included (Precision reported in brackets): Class (Integer); GPS Week Time
(0.0001 seconds); Easting (0.01 meter); Northing (0.01 meter); Elevation (0.01 meter);
Echo Number (Integer 1 to 4); Echo (Integer 1 to 4); Intensity (8 Bit Integer); Flightline
(Integer); Scan Angle (Integer Degree). The LAS files do not include overlap. The
data was classified as follows: Class 1 = Unclassified. This class includes vegetation,
buildings, noise etc. Class 2 = Ground Class 7 = Noise Class 9 = Water
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2010-10-20T00:00:00 |
The NOAA Coastal Services Center (CSC) received the files in las format.
The files contained Lidar elevation and intensity measurements. The data were in projected
in Florida State Plane Coordinates (East Zone, NAD83/HARN), and referenced to the
orthometric datum of NAVD88 utilizing Geoid 03. CSC performed the following processing
to the data to make it available within the Digital Coast: 1. The data were converted
from State Plane Coordinates (NAD83/HARN) coordinates to geographic coordinates (NAD83).
2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid)
heights using Geoid 03. 3. The LAS data were sorted by latitude and the headers were
updated.
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2011-09-19T00:00:00 |
The NOAA National Geophysical Data Center (NGDC) received lidar data
files via ftp transfer from the NOAA Coastal Services Center. The data are
currently being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are archived in LAS
or LAZ format. The LAS format is an industry standard for LiDAR data developed by
the American Society of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless
compressed version of LAS developed by Martin Isenburg (http://www.laszip.org/). The
data are exclusively in geographic coordinates (either NAD83 or ITRF94). The data
are referenced vertically to the ellipsoid (either GRS80 or ITRF94), allowing for
the ability to apply the most up to date geoid model when transforming to orthometric
heights.
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